Expanding reamer.



A. COATS.

EXPANDING REAMER.

APPLIOATIQN FILED mmzs, 191a.

LIQQJ Patented Feb. 23, 1915.

WITNESSES INVENTOR.

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THE NORRIS PETERS C0 PHOTO-L'ITHQ. wAsHINar0/u q. 1,

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ALLAN scams, or NEWARK, NEW JERSEY.

EXPANDING REAMER.

Application filed March 26, 1913.

To all whom it may concern Be it. known that I, ALLAN COATS, a subject of Great Britain, residing at Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Expanding Reamer-s, of which the following is a full and exact specification.

My invention has for its objects to provide simple and powerful means for holding the adjustable cutting tools securely; to enable said tools to be easily and readily adjusted to size; to allow the reamer to center itself relative to the hole, and to obtain other advantages and results as may be brought out in the following description.

Vith these ends in view the invention consists of certain features of novelty in construction and arrangement of parts by which the said objects are attained, an example of which invention will now be described with reference to the accompanying drawings, the invention being more particularly pointed out in the claims.

In the said drawings, like letters of reference indicate the same parts throughout the several views.

Figure 1 is a side view ofmy improved reamer with the tool-carrying end in section; Fig. 2 is another side view of the reamer looking in the direction at right angles to the line of vision in Fig. 1, also with the tool-carrying end in section; Figs. 3 and 4 are views similar to Figs. 1 and 2 illustrating certain slight modifications of construction; Fig. 5 is section on line XX, Fig. 1; Figs. (3 and 7 are views corresponding to Figs. 1 and 2 of a large reamer of my improved construction, and Fig. 8 is an end view of the same.

Referring to Figs. 1, 2 and 5 more especially, the reamer consists essentially of two sections A and B of which A is adapted to be fixed in the socket of a drill, lathe or other machine in which the reamer is used and the other of which, 13, carries the cutting tools and is capable of adjustment rela' tive to A. For this purpose the adjustable section B is pivoted on a transverse stud U fastened to the stationary section A, and a similar stud D also fastened to said stationary section A enters a curved slot E in Specification of Letters Patent.

the adjustable section B in order Patented Feb. 23, 1915. Serial No. 756,845.

that said adjustable section B may swivel around the stud C. Nuts F and G on-the studs C and D outside the adjustable section B enable the same to be clamped in fixed position with respect to the stationary section A.

At the outer end of the adjustable section B are the cutting tools H and. I, and for this purpose the said section is transversely and longitudinally sloted as at J a little distance from its extremity, and an upper clamping screw K works longitudinally of the section B from said end into said slot J. The tools H and I overlap sidewise upon eachother, as clearly shown, so that they can slide with respect to each other and the section B to vary the distance between their extremities. The said tools H and I do not fill the slot lengthwise of the section B, and between them and the end of the clamping screw K is placed an equalizer L whose function is to transmit the pressure of the clamping screw equally to the two cutting tools H and I so as to hold them firmly and rigidly for performing their work. To this end the equalizer has two engaging parts M and N to engage the two tools H and I, respectively, and as shown the equalizer lies in the slot J substantially parallel to the tools and engaging them longitudinally. This kind of an engagement is preferable. though not essential. The equalizer is free to tilt with respect to the tools, transversely of them as shown. and since it is tapered at its opposite side to receive the pressure of the clamping screw it will tilt under such pressure to transmit the same equally of the two cutting tools. This precludes any possibility of either tool being loose, and is an important feature of my invention.

Preferably a bearing block 0 is arranged between the equalizer L and clamping screw K, so as to insure the pressure of the clamping screw being applied at a point of con tact. In the construction shown, the bear ing block lies in the end of the hole for the clamping screw K and is rounded at its end next said screw to engage the rounded end of the screw at a central point, the other end of the bearing block being flat to engage the adjacent tapered edge of the equalizer.

In Figs. 3 and 4, I have shown cutting tools H I which are beveled inwardly toward each other at their edges next the equalizer L, said equalizer comprising a cylindrical piece arranged in the groove formed by the said beveled edges of the tools, and adapted to be engaged at its opposite side by a bearing block 0' like the one already described.

In both of the constructions described, the cross-section of the equalizer is such that it engages the bearing block substantially in the plane between the cutting tools, and at its opposite side engages the said tools at two separated points, thus forming a triangle joining the points of contact so that should one tool be of somewhat different width from the other the equalizer would tilt slightly under the pressure of the clamping screw and cause an equal pressure to be exerted on both tools to hold them in their proper position. Obviously the equalizer might be made of triangular crosssection or substantially so or otherwise varied from the precise cross-section shown in the drawing.

In order to use the reamer, the cutting tools H and I are first drawn out so that they would cut a hole of slightly larger diameter than desired. The clamping 'screw is then very lightly tightened so that the tools H and I can be pressed in without undue friction. This pressing in to the desired diameter may be suitably accomplished by means of an ordinary micrometer and when the desired diameter is reached the clamping screw K is tightened or set firmly. This completes the first stage of setting the cutting tools and insures that they will cut the correct diameter provided their cutting edges are equidistant from the center line of the hole. To thus locate the cutting edges equidistant from said center line, the whole reamer is adjusted so that the cutting tools are approximately central with the hole with regard to the plane of the studs C D. In cases where a taper socket such as at P in Figs. 1 and 2 is used, this is accomplished automatically provided the socket hole is true with the hole to be cut. Where the stationary section A is squared to enter a tool post, as in Figs. 3 and at, the adjustment is obtained by adjusting the tool-post, as will be understood. There remains then only the adjustment in a direction at right angles to the plane of the studs G D, and in order that the tools may take their proper position in this direction the section 13 must be able to swing in this direction. In order to accomplish this the section B is pivoted on stud C, and may be shaped as in Fig. 2 where the dividing line is in the center or as in Fig. 4 where a tongue on section B is fitted into a slot cut in section A, or in any other equidistant manner. Either stud may be the pivot on which section B swings and the other stud is used to clamp said section, or in small sizes only one stud is necessary. Assuming then that the cutting tools H and I have been set to their proper diameter, the work which has already had a hole made in is caused to rotate and the reamer is brought forward till the tools just touch the entrance to the hole, the nuts F and G and studs C and D in the meantime being only finger tight. The adjustable section 15 then swings on the stud O as a pivot so that both tools H and I are touching the entrance to the hole equally. The nuts F and G on studs G and D are then tightened and the reamer is put through the hole.

If the hole should be bored slightly eccentric the nuts F and G on studs U and D may be kept only finger tight while the reamer is put through the hole, so that the adjustable section 15 may follow the eccentricity of the hole.

In large diameters, where it is not convenient that the cutting tools should overlap each other, the arrangement shown in Figs. (3, 7 and 8 may be used, where the tools H and I are held in any usual manner in the adjustable section B which swings on the pivot stud C fastened to the stationary section A.

Having thus described the invention, what I claim is.-

1. In a reamer, the combination with two cutting tools, of an equalizer free to tilt with respect thereto and having a bifurcation one leg of which engages one of said tools and the other leg of which engages the other of said tools each with a line contact, and means for applying pressure to said equalizer.

2. In a reamer, the combination with two cutting tools arranged side by side, of an equalizer engaging both said tools longitudinally thereof each with a line contact and free to tilt transversely of the tool, and means for applying pressure to said equalizer.

3. In a reamer, the combination with two cutting tools arranged side by side, of an equalizer having a bifurcation parallel to said tools one leg of which is adapted to engage one of said tools and the other leg of which is adapted to engage the other tool, and means for applying pressure to said equalizer while permitting the same to tilt.

4. In a reamer, the combination with two cutting tools, of an equalizer engaging both said tools with a line contact and free to tilt with respect thereto, a bearing block engaging said equalizer, and a clamping screw for applying pressure to said bearing block.

5. In a reamer, the combination with a body portion having a transverse slot near force said equalizer against said cutting its end, tW cutting tools arranged in said tools. slot and ad ustable longitudinally thereof,

an equalizer also in said slot engaging said ALLAN COATS 5 cutting tools each with a line contact and Witnesses:

free to tilt, and a clamping screw Working HOWARD P. KING,

through the end of the body portion to JANET A. AYERS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

, Washington, D. C. 

